@inbook{1118243384,
author={Julio César Zavala Castillo},
editor={Torres, Eduardo Pérez  and Francis, Juan Miguel Abdo and Sahagún, Fernando Bernal and Stalnikowitz, David Kershenobich},
title={Tumores retroperitoneales},
booktitle={Gastroenterología},
publisher={McGraw-Hill Education},
address={New York, NY},
year={2015},
url={accessmedicina.mhmedical.com/content.aspx?aid=1118243384}
}